exam Maths Puzzle Numerical Ability

(3x-2y)^2=
a. 9x^2-4y^2
b. 9X^2+4y^2
c. 9x^2+4y^2-6xy
d. 9x^2+4y^2-12xy

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exam Other Question

I need to find the maximum and minimum volumes of these equations in order to find the max and min of the boxes.

a. v(x)= x(39-2x)(53-2x)
b. v(x)= x(38-2x)(55-2x)
c. v(x)= x( Evaluate:

[2*2-6] Note: the brackets are absolute value signs.

The answer that I got was -2, but that was not correct